The newlyweds were presumably on the east coast to attend the wedding of the 28-year-old entrepreneur’s Facebook co-founder Chris Hughes to longtime love Sean Eldridge.

Chris, who is currently the editor in chief and publisher of The New Republic, posted his wedding photos on his Facebook page! The wedding took place in his hometown of Garrison, N.Y.

Mark and Priscillatied the knot back in May in a secret ceremony held in their own backyard.

FYI: Facebook just rolled out a new feature on the site which allows same-sex couples to indicate their relationship on their timelines via same-sex emoticons rather than the standard one used for straight couples! More Here! »

The 28-year-old Facebook founder and Priscilla continued their honeymoon on the picturesque coastline after spending time in Rome earlier in the week.

The newlyweds reportedly toured the Sistine Chapel, the Colosseum, the Trevi Fountain, and the Spanish Steps and also had a low-key meal at Nonna Betta.

“They seemed like two lovebirds. They shared a plate of artichoke ravioli in the centre of the table. It was a very romantic scene,” owner Umberto Pavoncellorevealed about the couple’s meal, which came out to be just 32 euros (approximately $40).

Also pictured inside: Mark and Priscilla on Tuesday (May 29) on the Amalfi Coast.More Here! »

The 28-year-old Facebook founder announced the happy news with an update on his Facebook timeline. How appropriate!

The couple has been together for over nine years and married in his backyard in front of less than 100 guests, who thought they were attending a party to celebrate Priscilla‘s graduation from UC San Francisco’s medical school, according to a Huffington Post editor.

The wedding comes just a day after Facebook went public and Mark‘s wealth soared to $19 billion.

“This is an important milestone for Facebook because it’s the first time we’ve ever acquired a product and company with so many users. We don’t plan on doing many more of these, if any at all,” Mark shared. “But providing the best photo sharing experience is one reason why so many people love Facebook and we knew it would be worth bringing these two companies together.”

Sean, who was accompanied by his fiancee Alexandra Lenas, hosted the exclusive party to celebrate the f8 announcement of the Facebook and Spotify partnership. There were also performances from Brandon Flowers and The Killers, Jane’s Addiction, Snoop Dogg and Kaskade.

At the end of the night, Sean personally delivered two huge bowls of fresh fried chicken to Snoop‘s trailer. All of it was gone in minutes!